The CH out-of-plane bending modes of polycyclic aromatic hydrocarbon molecules in an astrophysical context

Details The CH out-of-plane bending modes of polycyclic aromatic hydrocarbon molecules in an astrophysical context The CH out-of-plane bending modes of polycyclic aromatic hydrocarbon molecules in an astrophysical context

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456...63h&link_type=abstract

ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP

Other

4

Iso, Interstellar Matter, Uir

Scientific paper

We present 10-15 μm spectra of a variety of sources that show strong unidentified infrared emission features, obtained with ISO/SWS. These spectra reveal a plethora of emission features with bands at 11.0, 11.2, 12.0, 12.7, 13.5 and 14.2 μm. These features are observed to vary considerably in relative strength to each-other from source to source. In particular, the 10-15 μm spectra of evolved stars are dominated by the 11.2 μm band while for H II regions the 12.7 is typically as strong as the 11.2 band. Bands in the 10-15 μm spectral region are due to CH out-of-plane bending modes of polycyclic aromatic hydrocarbons (PAHs). The peak position of these bands depends on the number of adjacent CH groups and hence the observed interstellar 10-15 μm spectra can be used to determine the molecular structure of the interstellar PAHs emitting in the different regions. We conclude that evolved stars predominantly inject compact, ~100-200 C-atom, PAHs into the ISM where they are subsequently processed, resulting in more open and uneven PAH structures.

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